US4482776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of ortho aromatic isomers by selective adsorption with an aluminophosphate
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-06-27
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Granted: 1984-11-13
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Expires: 2003-06-27
Abstract
Abstract An improved process for separating ortho aromatic isomers from a feed stream containing a mixture of aromatics by contacting the feed stream with a bed of the crystalline aluminophosphate adsorbent AlPO4-5. The adsorbed ortho aromatic isomers is removed from the adsorbent by desorption.
Inventors
- 👤 Daniel D. Rosenfeld
- 👤 Denise M. Barthomeuf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:43
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
86 words
An adsorptive separation process for separating the ortho aromatic isomers from a hydrocarbon feed stream containing a mixture of aromatics comprising: (a) contacting said hydrocarbon feed stream with a bed of a crystalline aluminophosphate adsorbent AlPO 4 -5; (b) withdrawing from said bed of adsorbent a raffinate stream containing less of the selectively adsorbed ortho aromatic isomer of the feed stream; (c) desorbing the adsorbed ortho aromatic isomer to effect displacement thereof and withdrawing from the adsorbent bed an extract stream containing the ortho aromatic isomer.
Claim 2
Dependent Claim
86 words
An adsorptive separation process for separating the ortho aromatic isomers from a hydrocarbon feed stream containing a mixture of aromatics comprising: (a) contacting said hydrocarbon feed stream with a bed of a crystalline aluminophosphate adsorbent AlPO 4 -5; (b) withdrawing from said bed of adsorbent a raffinate stream containing less of the selectively adsorbed ortho aromatic isomer of the feed stream; (c) desorbing the adsorbed ortho aromatic isomer to effect displacement thereof and withdrawing from the adsorbent bed an extract stream containing the ortho aromatic isomer.
Claim 3
Dependent Claim
29 words
Process of claim 1 further characterized in that prior to the adsorptive separation process an organic template used in the synthesis of said adsorbent is removed from said adsorbent.
Claim 4
Dependent Claim
25 words
Process of claim 2 wherein the organic template is removed from said adsorbent by calcining at 500° to 600° C. for at least 1 hour.
Claim 5
Dependent Claim
19 words
Process of claim 2 wherein the adsorbed aromatic components are desorbed by passing a desorbent material through said bed.
Claim 6
Dependent Claim
31 words
Process of claim 2 wherein the hydrocarbon feed stream contains a mixture of ortho-xylene and at least one of the aromatics selected from the group consisting of para-xylene, meta-xylene and ethylbenzene.
Claim 7
Dependent Claim
17 words
Process of claim 2 wherein the hydrocarbon feed stream contains a mixture of C 9 aromatics isomers.
Claim 8
Dependent Claim
17 words
Process of claim 2 wherein the hydrocarbon feed stream contains a mixture of C 10 aromatic isomers.
Claim 9
Dependent Claim
23 words
Process of claim 5 wherein the desorbent is selected from the group consisting of toluene, benzene, alkyl benzenes, halogenated hydrocarbons and mixtures thereof.
Claim 10
Dependent Claim
31 words
Process of claim 1 wherein the adsorbent has a framework structure with a formula in terms of mole ratios of oxides of Al 2 O 3 :1.0±0.2P 2 O 5 .
Claim 11
Dependent Claim
32 words
Process of claim 2 wherein the separation is carried out at a temperature within the range of ambient to 450° F. and a pressure within the range of atmospheric to 500 psig.
Claim 12
Dependent Claim
14 words
Process of claim 10 wherein the process is carried out in the liquid phase.
Claim 13
Dependent Claim
14 words
Process of claim 10 wherein the process is carried out in the vapor phase.
Claim 14
Dependent Claim
12 words
Process of claim 1 wherein the adsorbent is combined with a binder.
Claim 15
Dependent Claim
21 words
Process of claim 13 wherein the binder is selected from the group consisting of natural and synthetic clays and inorganic oxides.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |